SILICA MINERAL — any one of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various …Britannica English vocabulary

PYROXENE — any of a group of important rock-forming silicate minerals of variable composition, among which calcium-, magnesium-, and iron-rich varieties predominate. …Britannica English vocabulary

OLIVINE — any member of a group of common magnesium, iron silicate minerals. any member of a group of common magnesium, iron …Britannica English vocabulary

AMPHIBOLE — any of a group of common rock-forming silicate minerals. any of a group of common rock-forming silicate minerals. Amphiboles occur …Britannica English vocabulary

WOODLAND — Classification: City Located in: Washington (WA) Total Population (2000): 3780 Total Housing Units (2000): 1482 Land Area (square meters): 6488221 …U.S. Gazetteer English vocabulary